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This paper deals with reduction of the transmission power usage in the wireless sensor networks. A system with FEC can provide an objective reliability using less power than a system without FEC. We propose to study LDPC codes to provide reliable communication while saving power in the sensor networks. As shown later, LDPC codes are more energy efficient than those that use BCH codes. Another method to reduce the transmission cost is to compress the correlated data among a number of sensor... Topics: LDPC codes, Distributed Source coding, Source Channel coding, iterative decoding algorithm, layered...